Astronaut Eugene Cernan drives the lunar rover during Apollo 17, the last manned mission to the moon in 1972.
President Bush is expected to announce next week a major recommitment to the U.S. space program. Senior officials say the president will call for establishing a permanent human settlement on the moon and an eventual manned flight to Mars. Critics say the plan, which could cost at least $1 trillion, is unadvisable at a time of record deficits. Hear NPR's Don Gonyea and NPR's Richard Harris.